inoculateyoudaoicibaDictYouDict[inoculate 词源字典]
inoculate: [15] Far-fetched as the connection may seem, inoculate actually comes ultimately from Latin oculus ‘eye’ (source of English ocular [16] and oculist [17]). By metaphorical extension oculus was applied to the ‘bud’ of a plant (much like the eye of a potato in English), and the verb inoculāre was coined to denote the grafting on of a bud or other plan part.

That was how it was used when originally adopted into English (‘Peaches have their Season at May Kalends them to inoculate’, Palladius on Husbandry 1440), and the modern sense ‘introduce antigens into the body’ did not emerge before the early 18th century, based on the notion of ‘engrafting’ or ‘implanting’ an immunising virus into a person. It was originally used with reference to smallpox.
=> eye, ferocious, ocular[inoculate etymology, inoculate origin, 英语词源]
inoculate (v.)youdaoicibaDictYouDict
mid-15c., "implant a bud into a plant," from Latin inoculatus, past participle of inoculare "graft in, implant," from in- "in" (see in- (2)) + oculus "bud," originally "eye" (see eye (n.)). Meaning "implant germs of a disease to produce immunity" first recorded (in inoculation) 1714, originally in reference to smallpox. After 1799, often used in sense of "to vaccine inoculate." Related: Inoculated; inoculating.